1920.] S. Kemp : Notes on Crustacea Decapoda. 139 



The rostrum consists of a horizontal triangular plate, rather 

 strongly depressed and reaching almost to the end of the 'second 

 segment of the antennular peduncle. In dorsal view it is nearly 

 twice as long as its basal breadth. It bears a blunt median 

 ridge, not continued backwards on to the carapace, with a shallow 

 groove on either side. Near the base the lateral margin is reflected 

 upwards and in the distal two-thirds of its length it bears a 

 series of minute teeth or serrations, some 10 to 15 in number. 



The carapace is smooth and rounded ; its breadth is about 

 equal to its height and about two-thirds its length. The anterior 



Text-fig. i, 



a. Antennal scale. 



b. Mandible. 



c. Maxillula. 

 (/. Maxilla. 



Discias e.xul, sp. nov. 



e. First maxilliped. 



f. Second maxilliped. 



g. Third maxilliped. 

 h. Barbed spinule at end of 



ante-penultimate segment of third maxilliped 



border on either side of the rostrum is occupied mainly by the 

 very large semicircular orbit which is defined below by a strong 

 antennal spine. The antero-lateral angles are broadly rounded. 



The eyes are very large and nearly globular ; the breadth 

 of the hemispherical cornea is greater than the length of the stalk. 

 The black ocular spot, found near the cornea in many Caridea 

 is not visible. ' 



The antennular peduncle reaches almost to the end of the 

 antennal scale and is stout, with a lanceolate lateral process which 

 reaches a Httle beyond the middle point of the basal segment. 

 The outer margin of this segment is not provided with a distal 



